faith is that it is something unseen; and from this point of view
there are various distinct articles of faith, as we saw above.

Reply Obj. 3: This definition of an article is taken from an
etymology of the word as derived from the Latin, rather than in
accordance with its real meaning, as derived from the Greek: hence it
does not carry much weight. Yet even then it could be said that
although faith is exacted of no man by a necessity of coercion, since
belief is a voluntary act, yet it is exacted of him by a necessity of
end, since "he that cometh to God must believe that He is," and
"without faith it is impossible to please God," as the Apostle
declares (Heb. 11:6).
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SEVENTH ARTICLE [II-II, Q. 1, Art. 7]

Whether the Articles of Faith Have Increased in Course of Time?

Objection 1: It would seem that the articles of faith have not
increased in course of time. Because, as the Apostle says (Heb.
11:1), "faith is the substance of things to be hoped for." Now the
same things are to be hoped for at all times. Therefore, at all
times, the same things are to be believed.

Obj. 2: Further, development has taken place, in sciences devised
by man, on account of the lack of knowledge in those who discovered
them, as the Philosopher observes (Metaph. ii). Now the doctrine of
faith was not devised by man, but was delivered to us by God, as
stated in Eph. 2:8: "It is the gift of God." Since then there can be
no lack of knowledge in God, it seems that knowledge of matters of